[ubuntu] webcam not usable after wake-up

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Here is the problem : I have a Logitech webcame which is working fine with my ubuntu machine, the only problem is that every time I turn my laptop to sleep and wake it up again, the webcam doesn't work any more.
I usually do not turn off my laptop so when I sleep I get it to sleep as well. And then after a few days when I want to use my webcam to make a video chat with my family I have to restart my laptop. This is pretty annoying because I have to save a lot of documents first in order to restart safely.
Does any body else encounter the same problem as I do?
(Hardware)

Webcam stopped working in skype 2.2., it works in cheese, "system/preference/sound"(to turn on microphone) shows the webcam, skype "options/video devices" shows webcam- but 'test' just has a black screen. During calls, the other party sees my avatar image, I see incoming video. The blog/forum suggestions are mostly for Ubuntu 11 & 12.